阅读说明：本技术 一种基于液力耦合的储能调相机装置 (Energy storage phase modulation machine device based on hydraulic coupling ) 是由 王东阳 李志强 孙华东 郭强 李文锋 于 2021-06-22 设计创作，主要内容包括：本发明公开了一种基于液力耦合的储能调相机装置,包括：液力耦合器设备的动力输入端与同步调相机相连接,动力输出端与储能飞轮设备的动力输入端相连接；其中,所述同步调相机通过与液力耦合器设备连接的储能飞轮设备能够提高整个调相机装置的惯性时间常数,实现保持系统频率稳定；同时,当电网频率升高时,所述储能飞轮设备能够通过液力耦合器设备使储能飞轮升速,使整个装置从电网吸收有功功率上升；当电网频率下降时,所述储能飞轮设备能够通过液力耦合器设备使储能飞轮减速,使整个装置从电网吸收有功功率降低或向电网送出有功功率,从而使调相机装置具备一定的一次调频功能。(The invention discloses an energy storage phase modulator device based on hydraulic coupling, which comprises: the power input end of the hydraulic coupler equipment is connected with the synchronous phase modulator, and the power output end of the hydraulic coupler equipment is connected with the power input end of the energy storage flywheel equipment; the synchronous phase modulator can improve the inertia time constant of the whole phase modulator device through energy storage flywheel equipment connected with hydraulic coupler equipment, and the stability of system frequency is kept; meanwhile, when the frequency of the power grid is increased, the energy storage flywheel equipment can accelerate the energy storage flywheel through the hydraulic coupler equipment, so that the whole device absorbs active power from the power grid to increase; when the frequency of the power grid is reduced, the energy storage flywheel equipment can enable the energy storage flywheel to decelerate through the hydraulic coupler equipment, so that the whole device absorbs active power from the power grid to reduce or sends the active power to the power grid, and the phase modulator device has a certain primary frequency modulation function.)

1. An energy storage phase modulator apparatus based on fluid coupling, the apparatus comprising: a synchronous phase modulator, a fluid coupling device and an energy storage flywheel device; wherein the content of the first and second substances,

the power input end of the hydraulic coupler equipment is connected with the synchronous phase modulator, and the power output end of the hydraulic coupler equipment is connected with the power input end of the energy storage flywheel equipment;

the synchronous phase modulator can improve the inertia time constant of the phase modulator device through the energy storage flywheel equipment connected with the hydraulic coupler equipment, and the stability of the system frequency is kept;

when the frequency of the power grid is increased, the energy storage flywheel equipment can accelerate the energy storage flywheel through the hydraulic coupler equipment, so that the whole device absorbs active power from the power grid to be increased; when the frequency of the power grid is reduced, the energy storage flywheel equipment can enable the energy storage flywheel to decelerate through the hydraulic coupler equipment, active power absorbed by the whole device from the power grid is reduced or the active power is sent out to the power grid, and the phase modulator device has a primary frequency modulation function.

2. The apparatus of claim 1, wherein the energy storage flywheel device is disposed within a vacuum box.

3. The apparatus of claim 1, wherein the fluid coupling device is an adjustable speed fluid coupling device.

4. The apparatus of claim 3, wherein the adjustable speed fluid coupling device comprises: the device comprises an input shaft, a pump wheel, a turbine, a scoop tube, a gear set and an output shaft; wherein the content of the first and second substances,

one end of the input shaft is connected with the synchronous phase modulator, and the other end of the input shaft is connected with the pump wheel; the pump wheel and the turbine form a closed working cavity which enables liquid to flow circularly, the spoon pipe is inserted into the closed working cavity, and working oil is filled in the closed working cavity; the turbine is connected with one end of the gear set; the other end of the gear set is connected with one end of the output shaft, and the other end of the output shaft is connected with the energy storage flywheel device; the synchronous phase modifier drives the pump wheel to synchronously rotate through the input shaft, when the input shaft drives the pump wheel to rotate, under the combined action of the inner blades and the cavity of the pump wheel, the working oil obtains energy and is sent to the outer circumference side of the pump wheel under the action of inertial centrifugal force to form high-speed oil flow, the high-speed oil flow on the outer circumference side of the pump wheel forms a combined speed with the circumferential speed of the outlet of the pump wheel at a radial relative speed, rushes into the inlet radial flow channel of the turbine wheel and pushes the turbine wheel to rotate through the change of oil flow torque along the radial flow channel of the turbine wheel, the oil flows to the outlet of the turbine wheel and forms a combined speed with the circumferential speed of the outlet of the turbine wheel at the radial relative speed, flows into the radial flow channel of the pump wheel, obtains energy in the pump wheel again, and repeats the process of obtaining energy to form a circular flow circle of the working oil in the pump wheel and the turbine wheel, so that the pump wheel converts the input mechanical work into the kinetic energy of the oil, the turbine converts the kinetic energy of the oil into output mechanical energy to drive the gear set to rotate; when the scoop tube is inserted into the deepest part of the closed working cavity, the oil amount in the circulating circle is minimum, the deviation of the rotating speed of the pump wheel and the turbine is large, and the output rotating speed is minimum; when the scoop tube is inserted into the shallowest position of the closed working cavity, the oil amount in the circulating circle is maximum, the deviation of the rotating speeds of the pump impeller and the turbine meets a preset deviation threshold value, and the output rotating speed is maximum.

5. The apparatus of claim 4, further comprising:

the electro-hydraulic controller is connected with the spoon pipe and used for controlling the spoon pipe to lower when the frequency of the power grid is increased, so that the energy storage flywheel of the energy storage flywheel equipment is accelerated, the active power absorbed by the whole system from the power grid is increased, and the frequency of the power grid is reduced; when the frequency of the power grid is reduced, the scoop tube is controlled to be lifted, and the energy storage flywheel of the energy storage flywheel equipment is decelerated, so that the active power absorbed by the whole system from the power grid is reduced or the active power is sent out to the power grid.

6. The apparatus of claim 4, wherein the gear set comprises: a first gear and a second gear; wherein the first gear and the second gear are meshed; the first gear is coaxially connected with the input shaft, and the second gear is coaxially connected with the output shaft.

7. The device of claim 4, wherein the first gear to second gear ratio is greater than 1.

8. The apparatus of claim 4, further comprising: and the hydraulic coupler equipment is arranged in the fixed protection box body.

9. The apparatus of claim 8, wherein bearings are disposed between the stationary guard box and the input shaft.

10. The apparatus of claim 1, wherein said fluid coupling device is in an empty state when said synchronous condenser is activated.

Technical Field

The invention relates to the technical field of motors and electric appliances, in particular to an energy storage phase modulator device based on hydraulic coupling.

Background

When the new energy proportion is greatly improved, the trend of power electronics of the power system is increasingly aggravated, the voltage support, inertia support and frequency modulation capability of the power system are continuously weakened, and the safe and stable operation of the power system is seriously threatened. Therefore, GB 38755 safety and stability guide rule of power system issued in 2019 requires that a new energy station should provide a certain short-circuit capacity and inertia support for the system; meanwhile, the new energy station is required to improve the regulation capability, and a gas power station, a pumped storage power station, an energy storage power station and other regulation resources and dynamic reactive power regulation equipment such as a phase modulator, a static synchronous compensator, a static reactive power compensator and the like are required to be configured when necessary.

According to the previous research results and the national standard requirements, the small distributed phase modulation machine is used for carrying out on-site reactive compensation and inertia support on a new energy region, the problems of new energy consumption and improvement of the power grid stability level can be well solved, and the method is one of the current main technical schemes. The capacity of the novel distributed phase modulator can provide 4-5 times of the short-circuit capacity of the system, but the inertia time constant of the novel distributed phase modulator is only 30% -50% of that of a generator set with the same capacity, and the capacity of the novel distributed phase modulator is only 25% of that of a matched new energy station or a distributed energy source, so that the inertia supporting capacity of the phase modulator on the system is relatively deficient.

In addition, with the release of GB 38755, new energy station primary frequency modulation will also face stricter examination, and it may be the main technical direction in the future that new energy station reserves spare capacity or adds energy storage equipment to participate in primary frequency modulation. However, the reserved spare capacity will certainly reduce the effective utilization hours of new energy, and the economic benefit is not good.

Disclosure of Invention

The invention provides an energy storage phase modulator device based on hydraulic coupling, which aims to solve the problem of how to improve the inertia time constant of a phase modulator and enable the phase modulator to have primary frequency modulation capability.

In order to solve the above problems, according to one aspect of the present invention, there is provided a fluid coupling based energy storage phase modulator apparatus, the apparatus comprising: a synchronous phase modulator, a fluid coupling device and an energy storage flywheel device; wherein the content of the first and second substances,

the power input end of the hydraulic coupler equipment is connected with the synchronous phase modulator, and the power output end of the hydraulic coupler equipment is connected with the power input end of the energy storage flywheel equipment;

the synchronous phase modulator can improve the inertia time constant of the phase modulator device through the energy storage flywheel equipment connected with the hydraulic coupler equipment, and the stability of the system frequency is kept;

when the frequency of the power grid is increased, the energy storage flywheel equipment can accelerate the energy storage flywheel through the hydraulic coupler equipment, so that the whole device absorbs active power from the power grid to be increased; when the frequency of the power grid is reduced, the energy storage flywheel equipment can enable the energy storage flywheel to decelerate through the hydraulic coupler equipment, active power absorbed by the whole device from the power grid is reduced or the active power is sent out to the power grid, and the phase modulator device has a primary frequency modulation function.

Preferably, the energy storage flywheel device is arranged in a vacuum box.

Preferably, the fluid coupling device is an adjustable speed fluid coupling device.

Preferably, wherein said adjustable speed fluid coupling device comprises: the device comprises an input shaft, a pump wheel, a turbine, a scoop tube, a gear set and an output shaft; wherein the content of the first and second substances,

one end of the input shaft is connected with the synchronous phase modulator, and the other end of the input shaft is connected with the pump wheel; the pump wheel and the turbine form a closed working cavity which enables liquid to flow circularly, the spoon pipe is inserted into the closed working cavity, and working oil is filled in the closed working cavity; the turbine is connected with one end of the gear set; the other end of the gear set is connected with one end of the output shaft, and the other end of the output shaft is connected with the energy storage flywheel device; the synchronous phase modifier drives the pump wheel to synchronously rotate through the input shaft, when the input shaft drives the pump wheel to rotate, under the combined action of the inner blades and the cavity of the pump wheel, the working oil obtains energy and is sent to the outer circumference side of the pump wheel under the action of inertial centrifugal force to form high-speed oil flow, the high-speed oil flow on the outer circumference side of the pump wheel forms a combined speed with the circumferential speed of the outlet of the pump wheel at a radial relative speed, rushes into the inlet radial flow channel of the turbine wheel and pushes the turbine wheel to rotate through the change of oil flow torque along the radial flow channel of the turbine wheel, the oil flows to the outlet of the turbine wheel and forms a combined speed with the circumferential speed of the outlet of the turbine wheel at the radial relative speed, flows into the radial flow channel of the pump wheel, obtains energy in the pump wheel again, and repeats the process of obtaining energy to form a circular flow circle of the working oil in the pump wheel and the turbine wheel, so that the pump wheel converts the input mechanical work into the kinetic energy of the oil, the turbine converts the kinetic energy of the oil into output mechanical energy to drive the gear set to rotate; when the scoop tube is inserted into the deepest part of the closed working cavity, the oil amount in the circulating circle is minimum, the deviation of the rotating speed of the pump wheel and the turbine is large, and the output rotating speed is minimum; when the scoop tube is inserted into the shallowest position of the closed working cavity, the oil amount in the circulating circle is maximum, the deviation of the rotating speeds of the pump impeller and the turbine meets a preset deviation threshold value, and the output rotating speed is maximum.

Preferably, wherein the apparatus further comprises:

the electro-hydraulic controller is connected with the spoon pipe and used for controlling the spoon pipe to lower when the frequency of the power grid is increased, so that the energy storage flywheel of the energy storage flywheel equipment is accelerated, the active power absorbed by the whole system from the power grid is increased, and the frequency of the power grid is reduced; when the frequency of the power grid is reduced, the scoop tube is controlled to be lifted, and the energy storage flywheel of the energy storage flywheel equipment is decelerated, so that the active power absorbed by the whole system from the power grid is reduced or the active power is sent out to the power grid.

Preferably, the gear set comprises: a first gear and a second gear; wherein the first gear and the second gear are meshed; the first gear is coaxially connected with the input shaft, and the second gear is coaxially connected with the output shaft.

Preferably, the transmission ratio of the first gear to the second gear is greater than 1.

Preferably, wherein the apparatus further comprises: and the hydraulic coupler equipment is arranged in the fixed protection box body.

Preferably, bearings are arranged between the fixed protective box and the input shaft and between the fixed protective box and the input shaft.

Preferably, wherein said fluid coupling device is in an empty state when said synchronous phase modulator is started.

The invention provides an energy storage phase modulator device based on hydraulic coupling, which comprises: a synchronous phase modulator, a fluid coupling device and an energy storage flywheel device; the problem that the inertia time constant of the phase modulator is small can be solved, and meanwhile, the electro-hydraulic coupler can be fully utilized to be connected with energy storage flywheel equipment, and a certain primary frequency modulation function is provided for a power grid in a speed change adjusting mode.

Drawings

A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:

fig. 1 is a schematic diagram of a configuration of a hydrodynamic coupling-based energy storage phase modulator apparatus 100 according to an embodiment of the present invention;

fig. 2 is a physical diagram of an energy storage phase modulator arrangement based on fluid coupling according to an embodiment of the present invention.

Detailed Description

The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.

Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.

Fig. 1 is a schematic diagram of a configuration of a hydrodynamically coupled based energy storage phase modulator apparatus 100 according to an embodiment of the present invention. As shown in fig. 1, the embodiment of the present invention provides a hydrodynamic coupling-based energy storage phase modulation apparatus, including: a synchronous phase modulator, a fluid coupling device and an energy storage flywheel device; the problem that the inertia time constant of the phase modulator is small can be solved, and meanwhile, the electro-hydraulic coupler can be fully utilized to be connected with energy storage flywheel equipment, and a certain primary frequency modulation function is provided for a power grid in a speed change adjusting mode. The embodiment of the invention provides an energy storage phase modulator device 100 based on hydraulic coupling, which comprises: a synchronous phase modulator 101, a fluid coupling device 102 and an energy storage flywheel device 103.

Preferably, the power input end of the hydraulic coupler device 102 is connected with the synchronous phase modulator 101, and the power output end of the hydraulic coupler device is connected with the power input end of the energy storage flywheel device 103;

the synchronous phase modulator can improve the inertia time constant of the phase modulator device through the energy storage flywheel equipment connected with the hydraulic coupler equipment, and the stability of the system frequency is kept;

meanwhile, when the frequency of the power grid is increased, the energy storage flywheel equipment can accelerate the energy storage flywheel through the hydraulic coupler equipment, so that the whole device absorbs active power from the power grid to increase; when the frequency of the power grid is reduced, the energy storage flywheel equipment can enable the energy storage flywheel to decelerate through the hydraulic coupler equipment, active power absorbed by the whole device from the power grid is reduced or the active power is sent out to the power grid, and the phase modulator device has a primary frequency modulation function.

Preferably, the energy storage flywheel device is arranged in a vacuum box.

Preferably, the fluid coupling device is an adjustable speed fluid coupling device. The invention aims to solve the technical problem of how to greatly improve the inertia time constant of a synchronous phase modulator and enable the synchronous phase modulator to be used as a mechanical energy storage device so that the phase modulator device has a certain primary frequency modulation function. In the invention, the energy storage phase modulator device based on hydraulic coupling is composed of a synchronous phase modulator, a hydraulic coupling device with variable speed adjustment and an energy storage flywheel device, as shown in figure 2. In the figure, the leftmost side 1 is a phase modulator, the middle 2 is a speed-adjustable fluid coupling device, and the rightmost side 3 is an energy-storage flywheel device; the phase modifier is connected with the energy storage flywheel equipment through a speed-adjustable hydraulic coupler equipment. In addition, in order to reduce blast friction loss, the energy storage flywheel equipment is arranged in the vacuum box body.

In the invention, the synchronous phase modulator can greatly improve the inertia time constant of the phase modulator through the energy storage flywheel equipment connected with the hydraulic coupler, thereby realizing the purpose of keeping the frequency of the system stable; meanwhile, when the frequency of the power grid is increased, the device can accelerate the rotor of the energy storage flywheel equipment through the hydraulic coupler, so that the whole device can absorb electric energy from the power grid and convert the electric energy into mechanical energy of the energy storage flywheel. When the frequency of the power grid is increased, the energy storage flywheel equipment can accelerate the energy storage flywheel through the hydraulic coupler equipment, so that the whole device absorbs active power from the power grid to be increased; when the frequency of the power grid is reduced, the energy storage flywheel equipment can enable the energy storage flywheel to decelerate through the hydraulic coupler equipment, active power absorbed by the whole device from the power grid is reduced or the active power is sent out to the power grid, and therefore the phase modulator device has a certain primary frequency modulation function. The magnitude of the frequency modulation power is related to the frequency change speed of the hydraulic coupler, and the faster the frequency change speed of the hydraulic coupler is, the faster the change of the rotating speed of the flywheel is, and the faster the response of the primary frequency modulation function is.

In an electric power system, an important index for measuring the inertial support capability of a unit is the inertial time constant T of the unit_j. Due to the limitations of electromagnetic design and manufacturing cost, the inertia time constant of the phase modulator itself is usually 4-6s, and it has been very difficult to further increase the inertia time constant. Therefore, in order to increase the inertia time constant of the unit, the invention adopts a mode of additionally arranging the coaxial flywheel. Inertia time constant T of additionally arranged energy storage flywheel equipment_jlAnd its moment of inertia J_lRotational speed omega_rApparent power S of phase modulator_nThe relationship between them is:from the above equation, the inertia time constant of the flywheel is proportional to the square of its rotational speed. The flywheel speed n can be adjusted by the gear set with the transmission ratio i_rBy a factor of i, i.e. at flywheel speed n_r＝in_sAnd (4) rotating.

In addition, because the rotating speed of the phase modulator body depends on the system frequency, and the rotating speed is basically unchanged, the mechanical energy stored in the phase modulator cannot be converted into primary frequency modulation power during grid-connected operation. The invention changes the rotating speed of the energy storage flywheel equipment through the speed regulation type hydraulic coupler equipment, and realizes the lifting or reduction of active power absorbed by the energy storage flywheel equipment from a power grid, thereby realizing the purpose of primary frequency modulation.

Preferably, wherein said adjustable speed fluid coupling device comprises: the device comprises an input shaft, a pump wheel, a turbine, a scoop tube, a gear set and an output shaft; wherein the content of the first and second substances,

one end of the input shaft is connected with the synchronous phase modulator, and the other end of the input shaft is connected with the pump wheel; the pump wheel and the turbine form a closed working cavity which enables liquid to flow circularly, the spoon pipe is inserted into the closed working cavity, and working oil is filled in the closed working cavity; the turbine is connected with one end of the gear set; the other end of the gear set is connected with one end of the output shaft, and the other end of the output shaft is connected with the energy storage flywheel device; the synchronous phase modifier drives the pump wheel to synchronously rotate through the input shaft, when the input shaft drives the pump wheel to rotate, under the combined action of the inner blades and the cavity of the pump wheel, the working oil obtains energy and is sent to the outer circumference side of the pump wheel under the action of inertial centrifugal force to form high-speed oil flow, the high-speed oil flow on the outer circumference side of the pump wheel forms a combined speed with the circumferential speed of the outlet of the pump wheel at a radial relative speed, rushes into the inlet radial flow channel of the turbine wheel and pushes the turbine wheel to rotate through the change of oil flow torque along the radial flow channel of the turbine wheel, the oil flows to the outlet of the turbine wheel and forms a combined speed with the circumferential speed of the outlet of the turbine wheel at the radial relative speed, flows into the radial flow channel of the pump wheel, obtains energy in the pump wheel again, and repeats the process of obtaining energy to form a circular flow circle of the working oil in the pump wheel and the turbine wheel, so that the pump wheel converts the input mechanical work into the kinetic energy of the oil, the turbine converts the kinetic energy of the oil into output mechanical energy to drive the gear set to rotate; when the scoop tube is inserted into the deepest part of the closed working cavity, the oil amount in the circulating circle is minimum, the deviation of the rotating speed of the pump wheel and the turbine is large, and the output rotating speed is minimum; when the scoop tube is inserted into the shallowest position of the closed working cavity, the oil amount in the circulating circle is maximum, the deviation of the rotating speeds of the pump impeller and the turbine meets a preset deviation threshold value, and the output rotating speed is maximum.

Preferably, wherein the apparatus further comprises:

the electro-hydraulic controller is connected with the spoon pipe and used for controlling the spoon pipe to lower when the frequency of the power grid is increased, so that the energy storage flywheel of the energy storage flywheel equipment is accelerated, the active power absorbed by the whole system from the power grid is increased, and the frequency of the power grid is reduced; when the frequency of the power grid is reduced, the scoop tube is controlled to be lifted, and the energy storage flywheel of the energy storage flywheel equipment is decelerated, so that the active power absorbed by the whole system from the power grid is reduced or the active power is sent out to the power grid.

Preferably, the gear set comprises: a first gear and a second gear; wherein the first gear and the second gear are meshed; the first gear is coaxially connected with the input shaft, and the second gear is coaxially connected with the output shaft.

Preferably, the transmission ratio of the first gear to the second gear is greater than 1.

Preferably, wherein the apparatus further comprises: and the hydraulic coupler equipment is arranged in the fixed protection box body.

Preferably, bearings are arranged between the fixed protective box and the input shaft and between the fixed protective box and the input shaft.

Preferably, wherein said fluid coupling device is in an empty state when said synchronous phase modulator is started.

As shown in fig. 2, in the present invention, an adjustable speed fluid coupling device 2 comprises: an input shaft 4, a pump impeller 5, a turbine 6, a scoop tube 7, a gear set 8 and an output shaft 9. The spoon tube is inserted into the closed working cavity, and working oil is filled in the closed working cavity; the synchronous phase modifier drives the pump wheel to synchronously rotate through the input shaft, when the input shaft drives the pump wheel to rotate, under the combined action of the inner blades and the cavity of the pump wheel, the working oil obtains energy and is sent to the outer circumference side of the pump wheel under the action of inertial centrifugal force to form high-speed oil flow, the high-speed oil flow on the outer circumference side of the pump wheel forms a combined speed with the circumferential speed of the outlet of the pump wheel at a radial relative speed, rushes into the inlet radial flow channel of the turbine wheel and pushes the turbine wheel to rotate through the change of oil flow torque along the radial flow channel of the turbine wheel, the oil flows to the outlet of the turbine wheel and forms a combined speed with the circumferential speed of the outlet of the turbine wheel at the radial relative speed, flows into the radial flow channel of the pump wheel, obtains energy in the pump wheel again, and repeats the process of obtaining energy to form a circular flow circle of the working oil in the pump wheel and the turbine wheel, so that the pump wheel converts the input mechanical work into the kinetic energy of the oil, the turbine converts the kinetic energy of the oil into output mechanical energy, so as to drive the gear set to rotate; when the scoop tube is inserted into the deepest part of the closed working cavity, the oil amount in the circulating circle is minimum, the deviation of the rotating speed of the pump wheel and the turbine is large, and the output rotating speed is minimum; when the scoop tube is inserted into the shallowest position of the closed working cavity, the oil quantity in the circular circle is maximum, the deviation of the rotating speed of the pump impeller and the turbine is small, and the output rotating speed is maximum.

When the synchronous phase modifier is started, the hydraulic coupler equipment is in an emptying state, so that the synchronous phase modifier and the energy storage flywheel equipment are in a separated state, and the impact on a weak power grid when the synchronous phase modifier is started is reduced.

According to the invention, the height of the scoop tube is controlled by the electrohydraulic controller, and when the frequency of a power grid is increased, the scoop tube is controlled to be lowered, so that the energy storage flywheel of the energy storage flywheel equipment is accelerated, the active power absorbed by the whole system from the power grid is increased, and the frequency of the power grid is reduced; when the frequency of the power grid is reduced, the scoop tube is controlled to be lifted, so that the energy storage flywheel of the energy storage flywheel equipment is decelerated, the active power absorbed by the whole system from the power grid is reduced or the active power is sent out to the power grid, and the frequency of the power grid is improved.

The gear set includes: a first gear and a second gear; wherein the first gear and the second gear are engaged. The transmission ratio of the first gear to the second gear is greater than 1. Specifically, the transmission ratio can be set according to requirements, so that the size and other parameters of the energy storage flywheel device are set according to the transmission ratio. In addition, the fluid coupling device further includes: the input shaft, the pump impeller, the turbine, the spoon pipe, the gear set and the output shaft are all arranged in the fixed protection box body. Bearings (not shown in the figure) are arranged between the fixed protection box body and the input shaft and between the fixed protection box body and the input shaft.

Taking a small distributed phase modulator required by a 50MW new energy station as an example, according to the dynamic reactive power configuration proportion of the new energy station which is not less than 20%, the capacity of the phase modulator of the 50MW new energy station is about 10MVar, and the inertia time constant T of the phase modulator body_jAbout 5 s. In the embodiment, the phase modifier is connected with the flywheel through the hydraulic coupler, and the flywheel provides an inertia time constant of 20s, so that the inertia time constant which can be provided by the whole phase modifier system is 25s, and the inertia time constant converted to the new energy field station is 25s × 10/50 — 5s, namely after the phase modifier disclosed by the invention is installed on the new energy field station according to the capacity ratio of 20%, the equivalent inertia time constant of the new energy field station is increased by 5 s.

In this example, assuming a gear ratio of i, if the phase modifier speed is 3000rpm, the flywheel reference speed is 3000 i. The gear ratio of the gear set in this example may be between 3-4 times, taking into account the material carrying capacity of the flywheel at high speeds of rotation, and the flywheel operates at 9000-12000rpm when the phase modifier is rotating at 3000 rpm. When the structural parameters of the gear set are determined, the rotating speed adjusting range of the gear set is mainly determined by the speed adjusting characteristic of the hydraulic coupler. The wider the speed regulation range, the greater the frequency modulation capability the flywheel system may provide to the grid.

When the frequency of the power grid is increased without considering loss, the frequency modulation electric energy provided by the flywheel system to the power grid is as follows: (1.44-1). times.T_jl×S_n20 × 10 × 0.22mw.s 44mw.s 12.22 kw.h; the flywheel system providing power to the grid when the grid frequency decreasesThe frequency modulation electric energy is as follows: (1-0.64). times.T_jl×S_n20 × 10 × 0.18mw.s 36mw.s 10 kw.h. According to the calculation of 10% primary frequency modulation power of the new energy station, the required frequency modulation power is 5MW in the example, and the flywheel system can provide full primary frequency modulation support of 8.8s and 7.2s when the power grid frequency rises and falls respectively.

The energy storage phase modulator device based on hydraulic coupling utilizes the speed-adjustable hydraulic coupler equipment to hydraulically couple the synchronous phase modulator and the energy storage flywheel equipment, so that the inertia time constant is greatly improved, and the primary frequency modulation support of a new energy station is realized.

The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.